passwella.
Menu

JAMB Physics 2008 Question 13

Question 13

Friction

A motorcycle of mass 100 kg moves round in a circle of radius 10 m with a velocity of 5ms−1. Find the coefficient of friction between the road and the tyres. [g=10ms−2]

  1. A.25.00
  2. B.2.50
  3. C.0.50
  4. D.0.25
Show the answer and explanation

Answer: D (0.25)

Explanation

Friction provides the centripetal force: μmg = mv2/r, so μ = v2/(rg) = 25 ÷ (10 × 10) = 0.25.